Conversion Calculator

"mg/m3 to ppm" or "ppm to mg/m3"

The conversion equation is based on 25 ºC and 1 atmosphere:
X ppm   =   (Y mg/m3)(24.45)/(molecular weight)
Y mg/m3   =   (X ppm)(molecular weight)/24.45

Fill in either the "ppm" value (X) or the "mg/m3" value (Y) AND the molecular weight of the compound. Then press the "Calculate" button.
molecular weight:

ppm value
mg/m3 value
based on the molecular weight of
Remember to consider significant digits in your use of the answer.